Towards Lower Bounds for Complexity of 3-Manifolds: a Program

Details Towards Lower Bounds for Complexity of 3-Manifolds: a Program Towards Lower Bounds for Complexity of 3-Manifolds: a Program

2001-03-26

arxiv.org/abs/math/0103169v1

Mathematics

Geometric Topology

AMS-TeX, 43 pages, 22 figures

Scientific paper

For a 3-dimensional manifold $M^3$, its complexity $c(M^3)$, introduced by S.Matveev, is the minimal number of vertices of an almost simple spine of $M^3$; in many cases it is equal to the minimal number of tetrahedra in a singular triangulation of $M^3$. An approach to estimating $c(M^3)$ from below for total spaces of torus bundles over $S^1$, based on the study of theta-curves in the fibers, is developed, and pseudominimal special spines for these manifolds are constructed, which we conjecture to be their minimal spines. We also show how to apply some of these ideas to other 3-manifolds.

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